Metodik för detektering av vägåtgärder via tillståndsdata

• Main Authors: Andersson, Niklas, Hansson, Josef
• Format: Others
• Language: Swedish
• Published: Linköpings universitet, Statistik 2010
• Subjects: simple linear regression; reporting of road actions; misreporting; change point; road measurements; enkel linjär regression; rapportering av åtgärder; felrapportering; förändringspunkt; vägmätningar; Statistics; Statistik
• Online Access: http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-56839

The Swedish Transport Administration has, and manages, a database containing information of the status of road condition on all paved and governmental operated Swedish roads. The purpose of the database is to support the Pavement Management System (PMS). The PMS is used to identify sections of roads where there is a need for treatment, how to allocate resources and to get a general picture of the state of the road network condition. All major treatments should be reported which has not always been done. The road condition is measured using a number of indicators on e.g. the roads unevenness. Rut depth is an indicator of the roads transverse unevenness. When a treatment has been done the condition drastically changes, which is also reflected by these indicators. The purpose of this master thesis is to; by using existing indicators make predictions to find points in time when a road has been treated. We have created a SAS-program based on simple linear regression to analyze rut depth changes over time. The function of the program is to find levels changes in the rut depth trend. A drastic negative change means that a treatment has been made. The proportion of roads with an alleged date for the latest treatment earlier than the programs latest detected date was 37 percent. It turned out that there are differences in the proportions of possible treatments found by the software and actually reported roads between different regions. The regions North and Central have the highest proportion of differences. There are also differences between the road groups with various amount of traffic. The differences between the regions do not depend entirely on the fact that the proportion of heavily trafficked roads is greater for some regions.